Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues:
Re-rent revenue, Topic 842									$ 194	$ 142	$ 157
Revenues, Topic 842									7,460	6,536	7,288
Revenues, Topic 606									2,256	1,994	2,063
Revenues, Total	$ 2,776	$ 2,596	$ 2,287	$ 2,057	$ 2,279	$ 2,187	$ 1,939	$ 2,125	9,716	8,530	9,351
Total equipment rentals
Revenues:
Revenues, Topic 842									7,460	6,536	7,288
Revenues, Topic 606									747	604	676
Revenues, Total									8,207	7,140	7,964
Owned equipment rentals
Revenues:
Owned equipment rentals, Topic 842									6,840	6,056	6,777
Revenues, Total									6,840	6,056	6,777
Re-rent revenue
Revenues:
Re-rent revenue, Topic 842									194	142	155
Revenues, Total									194	142	155
Delivery and pick-up
Revenues:
Revenues, Topic 606									616	506	564
Revenues, Total									616	506	564
Other
Revenues:
Other, Topic 842									426	338	356
Revenues, Topic 606									131	98	112
Revenues, Total									557	436	468
Total ancillary and other rental revenues
Revenues:
Revenues, Topic 842									426	338	356
Revenues, Topic 606									747	604	676
Revenues, Total									1,173	942	1,032
Sales of rental equipment
Revenues:
Revenues, Topic 606									968	858	831
Revenues, Total									968	858	831
Sales of new equipment
Revenues:
Revenues, Topic 606									203	247	268
Revenues, Total									203	247	268
Contractor supplies sales
Revenues:
Revenues, Topic 606									109	98	104
Revenues, Total									109	98	104
Service and other revenues
Revenues:
Revenues, Topic 606									229	187	184
Revenues, Total									$ 229	$ 187	$ 184